Are you MOVING / MIGRATING permanently, or temporarily for a few months?
VERY BIG difference.
IF MOVING or MIGRATING: shipping is the easy part! Have you checked into Mexican regulations re permanent importation? Are you permanent immigrants? It's not a simple thing to just bring it with you. When permanently changing countries, the bike - or car - has to pass local regulations, and it may not be possible - into Canada for instance it's almost impossible unless it's "vintage", and very expensive if it's not. You will almost certainly have to pay import duties and taxes, which can be substantial some countries are 300% of the value of the bike!
IF you're moving your household, it can go in the same container as everything else.

It's PROBABLY not worth bringing it! Sell it, and buy locally. Yes I know that's painful, but it will be WELL worth it.

If TEMPORARILY importing, as in you're planning on touring the country for up to 90 days, then leaving to go somewhere else, then no big problem with all of the above, it's very straightforward.

So that brings us to shipping it. Have you checked out the Shipping section of the site? There are a number of shipping agents listed on the Links link on that page too.

Finally, why not by air? It will get there MUCH quicker and more reliably. All discussed on the above page.

Hope that helps!

__________________
Grant Johnson
Seek, and ye shall find.
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Inspiring, Informing and Connecting travellers since 1997!
www.HorizonsUnlimited.com